package com.hmdp.service.impl;

import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_TYPE_KEY;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public List<ShopType> queryTypeListWithCache() {
        // 先判断缓存list中的size是否大于0
        Long size = stringRedisTemplate.opsForList().size(CACHE_SHOP_TYPE_KEY);
        if(size == null || size <= 0){
            // 缓存重建
            LambdaQueryWrapper<ShopType> wrapper = new LambdaQueryWrapper<>();
            wrapper.orderByAsc(ShopType::getSort);
            List<ShopType> shopTypeList = list(wrapper);
            for (ShopType shopType : shopTypeList) {
                stringRedisTemplate.opsForList().rightPush(CACHE_SHOP_TYPE_KEY, JSONUtil.toJsonStr(shopType));
            }
        }
        List<String> range = stringRedisTemplate.opsForList().range(CACHE_SHOP_TYPE_KEY, 0, -1);
        List<ShopType> res = new ArrayList<>();
        if(range == null || range.size() <= 0){
            return res;
        }
        for (String type : range) {
            res.add(JSONUtil.toBean(type, ShopType.class));
        }
        return res;
    }
}
